def cusip_checksum(cusip)
    alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    num   = "0123456789"
    sum   = 0

    for i in range(1, 8)
        c = cusip[i - 1]
        v = 0
        if c in num
            v = int(c)
        else if c in alpha
            p = alpha[c] + 1
            v = p + 9
        else if c in "*@#"
            v = "*@#"[c] + 36
        end
        if (i % 2) = 0
            v *= 2
        end

        sum += int(v / 10) + (v % 10)
    end

    return (10 - (sum % 10)) % 10
end

if main
    codes = {"037833100", "17275R102", "38259P508",\
             "594918104", "68389X106", "68389X105"}

    for code in codes
        if int(code[len(code) - 1]) = cusip_checksum(code)
            println code + " is valid"
        else
            println code + " is invalid"
        end
    end
end